Friday Night Funkin’ Sunday Night Suicide is a mod based on Mouse.AVI, this mod has 4 songs: Unhappy, Happy, and Really Happy, this is the main week and are playable in Story Mode and Freeplay, the other song is Smile and is only playable in Freeplay.
MayMays4Days, the author of the mod: https://www.youtube.com/channel/UC5LWfrKwqWXLxgr_yVddFNQ
Download the mod at Gamebanana:
https://gamebanana.com/mods/325161
Timestamps:
0:00 Unhappy (Sad Mouse)
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Source